Study of the Effect of the Driving Force on the Kinetics of CO2 Hydrate Growth in Coal Particles

Coal and gas outbursts are geological disasters occurring in the process of coal mining that can cause serious casualties economic losses, among which CH 4 is main component mine gas. However, there still many seams around world dominated by CO 2 . Although frequency outburst accidents relatively low, very violent, notably difficult to control highly dangerous. The application hydration curing technology reduce pressure gradient CO2 effectively occurrence outburst. Accordingly, this paper, experimental studies on growth kinetics hydrate with three driving forces (2, 2.5, 3 MPa) were carried out under four different particle sizes (C1: 0.425–0.850 mm, C2: 0.250–0.425 C3: 0.180–0.250 C4: 0–0.180 mm) obtain kinetic parameters such as consumption, rate, heat decomposition during synthesis hydrate. results show nucleation time same size system does not follow decreasing trend increasing force. Gas consumption hydrates increased force, exists a critical value regarding effect force generation particles size. Under temperature conditions, could increase rate. With promoting gradually exceed inhibiting effect, promote formation. Through linear fitting, an equation average rate versus for C1-C4 systems fitted provide reference predict In medium, more required complete decomposition, remains stable, highest C1 indicating presence represents most stable state.